package com.rd.teacher.jichao.day18;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class TestIn {

    public static void main(String[] args) throws Exception {
        // System.in 是InputStream
//        Scanner scanner = new Scanner(System.in);
//        System.out.println();
        InputStream is = System.in;
        InputStreamReader reader = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(reader);
        // 逐层转化  先获取InputStream 然后获取InputStreamReader(转换流)
        // 最后再获取 BufferedReader
        String line = null;
        while (true) {
            line = br.readLine();
            if (line == null) break;
            if (line.equals("exit")) {
                System.exit(0);
            }
            System.out.println(line);
        }
        reader.close();
        br.close();
    }
}
